D84.822 Immunodeficiency due to external causes

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Use additional code

• code for external cause such as:
• exposure to ionizing radiation (W88)

Code also

• , if applicable, radiological procedure and radiotherapy (Y84.2)

Risk adjustment (HCC)

• CMS-HCC V22: HCC 47 — Disorders of Immunity
• RxHCC V08: HCC 99 — Immune Disorders
• ESRD V24: HCC 47

MS-DRG index

Defines the logic of DRG(s) 814-816 in MDC 16.

Code annotations containing back-references to D84.822

Back-references to D84

• Type 1 Excludes: D72 Other disorders of white blood cells ("immunity disorders (D80-D89)")

Diagnosis Index entries for D84.822

• Immunodeficiency › due to › external causes

Nearby codes

• D84.1 Defects in the complement system
• D84.8 Other specified immunodeficiencies
• D84.81 Immunodeficiency due to conditions classified elsewhere
• D84.82 Immunodeficiency due to drugs and external causes
• D84.821 Immunodeficiency due to drugs
• D84.822 Immunodeficiency due to external causes (this code)
• D84.89 Other immunodeficiencies
• D84.9 Immunodeficiency, unspecified